Cruise inventory

RRS Discovery DY032

Cruise summary report

Cruise Info. 
Ship name (ship code)RRS Discovery (74EQ)
Cruise identifierDY032
Cruise period2015-06-20 — 2015-07-08
StatusCompleted
Port of departureLiverpool, United Kingdom
Port of returnSouthampton, United Kingdom
PurposeResearch
ObjectivesThe oceanic water column and the underlying seabed change on a variety of temporal and spatial scales. The objective of the PAP observatory is to provide high temporal resolution (hours) of an increasing number of variables which are relevant from the perspective of the biology, physics and chemistry over a relatively small spatial scale (30km). The site has been under examination for over 20 years and during that time, substantial changes have been observed in the benthic environment. The intention is to sustain and enhance these observations in order that a deeper understanding is obtained into the processes which operate; in particular the responses to the changes which are currently taking place in the global environment. The objective of the cruise was primarily to service the infrastructure required for continuous sustained observation, and to put these into context using observations from the ship which as yet cannot be carried out autonomously. In parallel to maintaining and extending exisiting measurements, the over view was enhanced by parallel research into nitrogen cycling processes occurring in marine aggregates along with studies of the abundance, distribution of and composition of those aggregates. These investigations were carried out using a multi instrument observational approach combined with direct sampling. In addition the cruise achieved substantial sampling of the seabed of the PAP and associated abyssal hills, directly by coring and seasonally by time lapse photography.
Chief scientistRichard Stephen Lampitt (National Oceanography Centre, Southampton)
Coordinating bodyNatural Environment Research Council (NERC)
Ocean/sea areas 
GeneralCeltic Sea
North East Atlantic Ocean (limit 40W)
SpecificPorcupine Abyssal Plain
Measurements 
Physical oceanography 
CTD stationsQuantity: number of profiles = 16
Description: CTD measurements of pressure, salinity, temperature, oxygen, chlorophyll, plus water samples from some CTDs for chlorophyll, oxygen, salinity, DIC and Ammonia
Biology and fisheries 
Particulate organic matter (inc POC, PON)Quantity: number of stations = 6
Description: SAPS microplastics, ammonium, POC PA
Particulate organic matter (inc POC, PON)Quantity: number of stations = 13
Description: In situ in-line Hologram water column profiles, (0-250m); Biogeochemical analysis
Particulate organic matter (inc POC, PON)Quantity: number of stations = 36
Description: Snowcatcher water samples analysed for particle size and sinking speed
ZooplanktonQuantity: number of stations = 18
Description: WP2, plankton net, 200µm, to 200m, 3 x midnight, 3 x noon
ZoobenthosQuantity: number of hauls = 1
Description: Benthic trawls for collection of Macro benthos and fish
ZoobenthosQuantity: number of cores = 10
Description: MacroBenthos; MeioBenthos; Foraminifera; Preserved Samples; Ecological Analysis
Moorings, landers, buoys 
Physical oceanography 
Optics (eg underwater light levels)48° 0' 0" N  16° 0' 0" W — PAP1 Longterm Observatory Recovery
Optics (eg underwater light levels)49° 0' 0" N  16° 0' 0" W — PAP1 Longterm Observatory Deployment
Current meters48° 0' 0" N  16° 0' 0" W — PAP3 deepwater sediment traps Recovery
Current meters48° 0' 0" N  16° 0' 0" W — PAP3 deepwater sediment traps Deployment
Chemical oceanography 
Oxygen48° 0' 0" N  16° 0' 0" W — PAP3 deepwater sediment traps Deployment
Oxygen48° 0' 0" N  16° 0' 0" W — PAP1 Longterm Observatory Recovery
Oxygen48° 0' 0" N  16° 0' 0" W — PAP3 deepwater sediment traps Recovery
Oxygen49° 0' 0" N  16° 0' 0" W — PAP1 Longterm Observatory Deployment
Carbon dioxide48° 0' 0" N  16° 0' 0" W — PAP1 Longterm Observatory Recovery
Carbon dioxide49° 0' 0" N  16° 0' 0" W — PAP1 Longterm Observatory Deployment
Nitrate48° 0' 0" N  16° 0' 0" W — PAP1 Longterm Observatory Recovery
Nitrate49° 0' 0" N  16° 0' 0" W — PAP1 Longterm Observatory Deployment
pH49° 0' 0" N  16° 0' 0" W — PAP1 Longterm Observatory Deployment
pH48° 0' 0" N  16° 0' 0" W — PAP1 Longterm Observatory Recovery
Biology and fisheries 
Primary productivity49° 0' 0" N  16° 0' 0" W — PAP1 Longterm Observatory Deployment
Primary productivity48° 0' 0" N  16° 0' 0" W — PAP1 Longterm Observatory Recovery
Sediment traps48° 0' 0" N  16° 0' 0" W — PAP3 deepwater sediment traps Recovery
Sediment traps48° 0' 0" N  16° 0' 0" W — PAP3 deepwater sediment traps Deployment
Zooplankton48° 0' 0" N  16° 0' 0" W — PAP1 Longterm Observatory Recovery
Zooplankton49° 0' 0" N  16° 0' 0" W — PAP1 Longterm Observatory Deployment
Zoobenthos48° 0' 0" N  16° 0' 0" W — Time lapse Camera Deployment
Zoobenthos48° 0' 0" N  16° 0' 0" W — Time lapse Camera Recovery
Geology and geophysics 
Bottom photography48° 0' 0" N  16° 0' 0" W — Time lapse Camera Recovery
Bottom photography48° 0' 0" N  16° 0' 0" W — Time lapse Camera Deployment